How to Check Inverter Battery Health: Easy Guide!

How to Check Inverter Battery Health: Easy Guide!

Inverter batteries are one the most important components in the system of power. We’ve all experienced how difficult it is to experience a power loss. Your inverter fails to perform because the battery is not functioning or the voltage is inadequate for electricity.

Follow These Steps to Check the Condition of the Inverter’s Battery:

Check the Condition of the Inverter’s Battery

Please note that this article is intended for educational purposes. Do not attempt to test the battery yourself. We suggest taking your battery to someone who knows inverters and batteries thoroughly.

They will be able to check your battery for problems and replace it before it worsens!

  1. Fully charge the battery: The initial step in this process is to be sure that you’ve recharged the battery of your inverter before you can conduct a maintenance inspection.
  2. Unplug the battery from the inverter: Once you have confirmed that the inverter’s battery has been fully charged, turn off the inverter, disconnect it from the power source, and then disconnect your battery to the inverter.
  3. Ensure that the terminals are clean: Make sure there aren’t any layers of battery terminals. Inverter batteries produce lead sulfur. The build-up makes the current route through the battery more prone to damage, which could result in your system’s power requirements not being met or, in some cases, worse. This can be removed using a nylon brush and warm water.
  4. Verify the levels of acid for the proper operation of your battery inverter: It is vital to ensure a consistent level of acid throughout the cells. Each cell is opened and then filled with distilled water up to the maximum amount above.
  5. Check the colour of the acid: Take the float indicators off and examine the colour of the acid using the hydrometer. If you find dark brown or black-coloured liquid, your battery might be damaged or near the end of its life. If it’s colourless, it’s healthy.
  6. Control the voltage: Test the battery’s voltage using a voltmeter/multimeter with an active probe of the multimeter to one end of the battery’s terminal and one negative probe on the opposite side of the terminal for the battery. When the battery’s voltage rises to higher than 11.9 Volts, then it’s in good condition. If it is lower than 10 volts, it suggests a problem with the battery.
  7. Specific Gravity: Check the specific gravity by utilising a hydrometer to determine how much electrolyte is specific to it within every cell. The fully charged battery should have an SG read of 1.240 or greater.
  8. Check for loose or damaged Connections: Check the battery’s wires for damage or melts in the insulation. The exposed or damaged wire may affect not just the output of your battery but may also increase the risk of short circuits and other risks within your home.
  9. ENSURE that your surfaces are clean: To ensure that your battery is operating well, make sure you check for dirt that may be on the surface. If you find any dirt, you can use a clean cloth to clean it off and ensure that the battery is clear!

Expert’s Words:

We hope that this information can be of use to you.

It is crucial to ensure the battery you have is in top shape. This will ensure that the inverter that you have installed is working properly and will be able to meet your requirements in the long run.

Be aware that this article is only for informational purposes. Do not attempt to test the battery yourself. We suggest taking the battery to an expert who knows batteries and inverters in depth.

They will be able to check the battery for any faults and replace it before the problem worsens!

How to Calculate Inverter Battery Backup Time [Run Time] – The Formula

How to Calculate Inverter Battery Backup Time_

When you are looking to purchase the inverter batteries for their office, home or shop, or any other use, the main concern is when will this battery be used?

The time to recharge the battery is different between batteries and the load it will be carrying. Most likely, the battery of your inverter is to last from 3-8 hours after it’s fully charged, based on the battery’s capacity and the load requirements.

A time-based backup is not guaranteed since it depends on many factors, like how much power your battery and, its condition and the loads it will carry.

Let’s figure out the backup time by using a calculator that is easy to use and an equation.

Are you having difficulty understanding the inverter battery backup time?

Don’t worry. Take the following steps and the illustrations listed below to help determine your backup battery’s time.

1. Know the Battery Capacity:

Battery capacity is the measure of how fast current flows, and it is expressed in ampere-hour. More Ampere hours mean the electricity flows quickly and delivers greater power for appliances.

You can locate the battery’s capacity in the user’s manual, in the product description or on the back of the battery.

2. Find the Input Voltage of the Battery:

The voltage of your battery is the measure of potential in the battery. It is measured in voltage in volts. The higher the voltage, the more current circulates through the battery, generating power for appliances.

The majority of home Inverter batteries have 12V. This information can be found in the user’s instruction manual.

3. Calculate the Current Load(Watt) Requirement:

Load refers to the amount of energy consumed per hour by appliances connected to an inverter. It is measured in Watts. The amount of watts each appliance uses is usually listed in the product’s packaging. Utilize our easy load calculator to determine the load.

Note Take note of the load requirements for only the appliances that are connected to your inverter or are planning to use in power interruptions through an inverter.

4. Check the Efficiency of the Battery:

The battery’s efficiency is the amount of energy you can get from your battery about the quantity of energy you invest. Some loss occurs when you discharge.

Efficiency percentages differ between batteries and can be found in the product catalogue or contact your battery manufacturer. Generally, you could expect an efficiency of around 80 per cent, i.e. 0.8, from the best battery brands such as Luminous, Exide, and Amaron.

5. Calculate the Backup Time [Run Time]:

The time to backup (in hours) = Battery Capacity (in Ah) + the input voltage (V) + Efficiency %(n) (n) / Total load (In Watts)

Tips to Improve Battery Backup Time:

Tips to Improve Battery Backup Time

To ensure that your battery lasts when power is cut off, You should concentrate mostly on the following aspects:

1. Get a Higher Capacity Inverter Battery

If you intend to power larger or heavier appliances in your home, you’ll need an energy-efficient battery. A larger capacity will allow you to carry a larger load on it, and consequently, you’ll have an extended backup time.

You can experiment with the calculator to see the amount of battery and load that could impact the time to backup.

2. Decrease the Load:

When you reduce the load, you can improve backup duration. A lower load will mean that there are fewer appliances. This means your inverter can power small appliances for a longer period.

If you’re in one space, perhaps you just require 1 fan and one tube light at this particular moment. Make sure you shut off the high appliances and appliances from other rooms so that the inverter can only handle a small load. Use only the essential electrical appliances.

3. Provide Periodic Maintenance:

Make sure to maintain the inverter and battery to keep them running at the highest efficiency for backup. Check the water level regularly, keep them free of corrosion, and provide a regular, general check-up with the assistance of a professional.

4. Consider Changing the Battery When Needed:

With time, the battery’s capacity decreases, which reduces the recharge time. It is recommended to replace the battery after 3 years based on the manufacturers’ recommendations.

5. Use Energy-Saving Appliances:

Find alternatives that reduce power consumption while serving your goal. This is an excellent option to lower your cost and extend the amount of backup time. For E.g. use LED and CFL bulbs in place of standard bulbs.


1. How can you determine your inverter’s battery’s capacity?

The battery’s capacity is on the user’s manual or the product’s description or on the back of the battery itself. 100 Ah,120 Ah, 150 Ah, 135 Ah, 180 Ah, 200 Ah, 220Ah, 240 Ah, etc., are the capacities of the battery.

2. How can you know the power consumption of every appliance?

The amount of watts an appliance consumes is typically listed on the label for the device. Alternatively, you can look up the watt consumption of any appliance online and use the approximate figures to make your calculations.

3. Does the brand inverter calculate and provide an estimated backup time?

A reputable company’s inverter will provide an estimate of its performance. The time calculation is according to how much battery is being charged and the number of appliances being operated at any given moment.

4. What type of inverter battery is the best backup battery?

Between Gel Tubular and Flat batteries, we suggest opting for Tubular batteries since they are designed for an emergency, fast and full backup. In the case of Tubular, choose Tall tubular, as they offer several other advantages.

5. What is the minimum backup time to be looking for when purchasing the inverter batteries?

A minimum backup time between 3 and 4 hours would be ideal. But, if your location has frequent or lengthy power outages, you should plan for between 6 and 8 hours.

6. Which inverter battery is suitable for 4 to 6 hours of backup?

We suggest going for above 150 Ah batteries depending on your load requirements. 

7. Which inverter battery is suitable for 8-10 hours of backup?

We recommend going for above 200 Ah batteries depending on your load requirements. You can determine the needed capacity of your battery by using the calculation tools available online.

8. How much backup power does a Triple or double battery inverter give you?

It is enough to add the total number of cells attached to the inverter using the formula above.

The formula for calculating a the multi-battery-inverter formula is: Backup Time (in hours) = [Battery Capacity (in Ah) + The Input Voltage (V) (x Efficiency %(n) + Total load (In Watts)* N

In this case, “N” is the number of batteries.

9. What’s the significance of 1100 or 900 VA of the inverter’s capacity in the battery backup calculation?

The capacity of the battery inverter is not directly relevant to the calculation of battery backup.

10. What amount of battery backup can an inverter battery with 24 volts provide?

Simply replace 24v with 12v according to the calculation above.

So the formula to calculate a the inverter with multiple batteries is: Backup Time (in hours) = [Battery Capacity (in Ah) (in Ah) x 24 v * Efficiency %(n) + Total load (In Watts)[]

Expert’s Words

I hope this article will help you understand how an inverter battery’s backup timing is calculated and how to get an extended backup time. In general, there is an estimated time for backup on the inverter battery.

Still, it’s an excellent idea to perform some calculations before looking to purchase a new inverter battery.

How to Increase Inverter Battery Life?

How to Increase Inverter Battery Life

Okay, you’ve got an inverter battery in your possession or are looking to purchase one. Regardless you’ll need to prolong the life of the inverter battery and hope it will last for a long time.

You will see different people using the same battery model; however, for certain people, it is more durable.

Why do you think this is the case?

The answer is easy. Care!

Extending your inverter’s battery’s lifespan is possible if you take care of it.

It’s not difficult nor requires a significant amount of time investment. All you need to do is give your pet(battery here) much attention.

Tips to Improve Your Inverter Battery’s Life Like a Pro

Here are some suggestions that you must keep in mind to extend the life of your battery:

  • Keep the battery in a warm and airy area. This helps it disperse the heat quickly and thus maintain it as cool as possible.
  • The surface of the battery gets dirty at times. Be sure to clean it with a soft cloth. Make sure it is as clean as you can.
  • Check that you have the terminals of your batteries free of dirt. If you notice something odd on the battery terminals, you might have to speak with the business’s customer support department.
  • The water level in the battery must not fall below the minimum threshold. I recommend testing the battery every 30-40 days and ensuring that the water level is not below the minimum level.
  • Make sure to give it a general maintenance review with the assistance of professional experts according to manufacturer guidelines.
  • Ensure the battery is away from any heat or smoke and so on. Make sure it is safe from the flame to avoid any incidents.
  • Be sure that the battery is working. If there aren’t enough power outages in your region, you could completely discharge the battery and recharge it monthly.
  • Refill the water by using only distilled water. Do not use tap water since it contains impurities that could negatively affect your health.


Batteries form the core that makes up an inverter. If they are maintained with good treatment, they’ll last for a long time.

I’m sure these easy tips will assist you.

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  • Post category:Guides
  • Post last modified:July 7, 2022


Nishant Rajput is the CEO and the head author at He recently returned from Melbourne, Australia, after studies. Nishant is an engineer and carries colossal enthusiasm for guiding the Indian public to invest money in the right products. He hires a paid team of experts for analyzing data and narrating comprehensive reviews & guides! Besides that, he's a martial artist, gym freak, guitarist, and singer.

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